Earplug



FIG. 1 is a perspective view showing my new design for an earplug;

FIG. 2 is a side elevational view thereof;

FIG. 3 is a top elevational view thereof;

FIG. 4 is a bottom plan view thereof;

FIG. 5 is a perspective view showing a second embodiment of my new design for an earplug;

FIG. 6 is a side elevational view thereof;

FIG. 7 is a top elevational view thereof; and,

FIG. 8 is a bottom plan view thereof.

The phantom lines in FIGS. 1 and 5 illustrate the environment of my new design, and form no part of the claimed design. 

The ornamental design for an earplug, as shown and described. 